Refractory material



NITE STATES PATENT OFFICE. j

EDWARD 1). FROHMAN, 0F PITTSBURGH, PENNSYLVANIA.

REFRACTORY MATERIAL.

No Drawing.

To all whom it may concern:

'Be it known that I, EDWARD D. F ROHMAN, residing at Pittsburghp in thecounty of Allegheny and State of Pennsylvania, a citizen of the UnitedStates, have invented or discovered certain new and useful Improvementsin Refractory Materials, of which improvements the following is a specification.

As is well known in the art, a. mixture of fire clay and siliciousmaterial, such as ganister, asbestos, etc., will begin to coalesce atabout 2500 degrees'F. and that by adding silicate of soda to such amixture a permanent binding of the materials WilLbegin at a lowertemperature, dependent upon the amount of silicate of soda added. Theobjection to this mixture is the diiiiculty of preparing it for use atthe point of use on account of the slow solubility of the silicate ofsoda.

The object of the invention described herein is to provide a mixture offine clay, silicious material and another which is readily soluble inwater and when so dissolved will form a binder having an efficiencyequal to that of the'silicate of soda.

Shipment of materials mixed with silicate of soda requires theemployment of liquid tight receptacles and freight must be paid on theliquid contents, whereas the mixture claimed herein may be shipped inany kind of receptacles which will protect it from moisture and nofreight is paid on mere liquid.

In the practice of the invention fire clay and a silicious material asganister or asbestos in a powered or finely divided condition and finelydivided wood pulp refuse or Specification of Letters Patent.

material Patented Jan. 13', 1920.

Application filed April 26, 1919. Serial No. 292,827.

sulfite pitch are thoroughly mixed together. The fire clay and siliciousmaterial may be used in equal or any desired relative proshipped to thepoint of use and rendered capable of use merely by the addition of waterin quantities dependent upon the con sistency desired.

As is well known in the art, a mixture of fire clay and siliciousmaterial can be rendered plastic by the addition of water, but when sucha mass is dried out it cracks and crumbles. \Vhen silicate of soda isused as a binder no cracking or crumbling will occur and the same istrue of the mixture claimed herein, which however has the advantage thatit may and can be shipped in a dr condition and prepared for use by theaddition of water.

I claim herein as my invention:

1. A refractory materialconsisting of a mixture of finely divided dryfire clay, silicious material and sulfite pitch.

2. A refractory material consisting of a mixture of finely divided fireclay, silicious material, sulfite pitch and Water.

3. A refractory material consisting of a mixture of finely divided dryfire clay, ganister and sulfite pitch.

In testimony whereof I have hereunto set my hand.

EDWARD D. FROHMAN.

